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efi_loader: comments for efi_install_fdt()

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Describe that efi_install_fdt() defaults to using the device tree
indicated by environment variable fdtcontroladdr.

ACPI tables and device trees are mutually exclusive.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-05-12 20:16:25 +02:00
parent 7e92db810b
commit e2d82f8b2a
1 changed files with 8 additions and 3 deletions
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11
cmd/bootefi.c
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@ -196,11 +196,16 @@ static void *get_config_table(const efi_guid_t *guid)
/**
* efi_install_fdt() - install fdt passed by a command argument
*
* If fdt_opt is available, the device tree located at that memory address will
* will be installed as configuration table, otherwise the device tree located
* at the address indicated by environment variable fdtcontroladdr will be used.
*
* On architectures (x86) using ACPI tables device trees shall not be installed
* as configuration table.
*
* @fdt_opt: pointer to argument
* Return: status code
*
* If specified, fdt will be installed as configuration table,
* otherwise no fdt will be passed.
*/
static efi_status_t efi_install_fdt(const char *fdt_opt)
{